3x-7(-6x-21)=12

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Solution for 3x-7(-6x-21)=12 equation: 



3x-7(-6x-21)=12

We move all terms to the left:

3x-7(-6x-21)-(12)=0

We multiply parentheses

3x+42x+147-12=0

We add all the numbers together, and all the variables

45x+135=0

We move all terms containing x to the left, all other terms to the right

45x=-135

x=-135/45

x=-3

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